He can't be equipped, you can't give him an aura and you can't target him with instants and sorceries, but he's also usually a lethal threat on the turn he hits the field
Because the cards dont belong to Pope Leo XIV and arent regularly used by him, but have come into contact with his hands, they might count as third class relics
Indestructible Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents of their choice.) When Ulamog is put into a graveyard from anywhere, its owner shuffles their graveyard into their library
The enchanted card has Tiana dancing in her own restaurant, with waiters and guests dancing around her
Either way, the best outcome is the same: keep the community trustworthy, keep trading fun, and dont reward the counterfeit ecosystem.